JPS6346397Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses electrical displays with relatively low power consumption, such as liquid crystal displays and light emitting diode displays (hereinafter, liquid crystal displays will be described as examples of these electrical displays). ) This relates to a ground-mounted refueling system using a fuel tank.

Generally, a ground-mounted refueling system houses a pump operated by a motor and a flow meter in the main body of the refueling system installed on an island, a hose is connected to the outflow side of the flow meter, and a refueling nozzle is connected to the tip of the hose. The basic configuration is to provide

In such a refueling device, the amount of refueling is electrically displayed on the liquid crystal display, and the motor is started.
Stopping is linked to the refueling nozzle being hooked into and removed from the nozzle housing, and these controls are performed by a calculation device such as a microcomputer, and if necessary, unit price setting functions, refueling amount, or price can be set using a unit price setting switch. A device is known that has an additional function of presetting the amount of oil supplied using a setting switch.

For this reason, the conventional oil supply device includes a flow rate transmitter that is attached to a flow meter and outputs a flow rate signal proportional to the measured flow rate, and a nozzle storage part in which the oil supply nozzle is placed. a nozzle switch that detects disconnection; a liquid crystal display that displays the amount of oil to be supplied, a unit price, and the amount of money to be refueled; a unit price setting switch that sets the unit price of the amount of oil to be supplied; Signals from the flow rate transmitter, nozzle switch, unit price setting switch and oil supply amount setting switch are input,
The amount of refueling and amount of refueling are calculated and the calculation results are displayed on the liquid crystal display and a sales office machine installed in the gas station office (hereinafter, the sales office machine is referred to as "POS").
an arithmetic device that outputs a motor drive signal for controlling the start and stop of the motor, and outputs a quantitative signal to the motor or a solenoid valve in the piping in the case of preset lubrication using a lubrication amount setting switch; A power supply unit that steps down the commercial power supply and supplies power to each of the above-mentioned devices, a motor relay that is operated by a motor drive signal from the arithmetic unit, and a motor relay that is provided between the commercial power supply and the motor, and a magnetic switch that starts and stops the motor using a relay, a POS interface circuit provided between the arithmetic unit and the POS, and a POS interface circuit provided between the arithmetic unit and the POS, and when a solenoid valve is used as the quantitative stop device, the It consists of a solenoid valve relay that operates the solenoid valve in response to a signal.

On the other hand, since refueling systems installed at gas stations handle hazardous materials such as gasoline, they are required to have a required explosion-proof structure. Therefore, due to the arrangement of each device, the conventional technology described above has a liquid crystal display, an arithmetic unit, and a POS interface circuit in a single flameproof explosion-proof container (hereinafter, a flameproof explosion-proof container is referred to as a "pressure container"). ), the transmitter, nozzle switch, unit price setting switch, and oil supply amount setting switch are each housed in one pressure-resistant container, and the power supply unit, motor relay, magnet switch, and solenoid valve relay are housed in one pressure-resistant container. It was designed to be housed in a pressure-resistant container.

However, the above-mentioned conventional technology has many drawbacks as follows.

First of all, since the liquid crystal display is mounted at the back of the pressure container, the viewing angle is narrow and it is difficult to check the amount of fuel to be filled, the amount of money, etc. In other words, the pressure container containing the liquid crystal display is made of cast iron, and only the part facing the liquid crystal display is made of transparent glass. Since the liquid crystal display is mounted in the refueling system, when the pressure container is mounted inside the refueling system, if you look at the liquid crystal display from outside the refueling system, you will see that the liquid crystal display is located further back. The disadvantage was that the display surface was difficult to see and the viewing angle was very narrow. Second, since the equipment that should be housed in pressure-resistant containers is distributed in the main body of the refueling system, a total of six pressure-resistant containers are required as described above, and many pressure-resistant containers are required for each pressure-resistant container. This method requires a large amount of space, increases the size of the refueling device, and has the disadvantage that the layout is subject to many restrictions. Third
However, it has the disadvantage that it requires a large number of pressure-resistant containers, making it expensive.

On the other hand, among the conventional technologies, by separately providing an intrinsically safe holding circuit consisting of a contact barrier such as an overvoltage limiting relay on the front side of the flow transmitter and nozzle switch, these can be placed outside the pressure vessel. There are also known ones that do this. but,
When configured in this way, it is necessary to provide individual contact barriers for the flow rate transmitter, nozzle switch, etc., which only increases the complexity of the circuit configuration.

The present invention was devised in view of the shortcomings of the prior art described above, and is a ground-mounted refueling system that makes it easier to visually see the displayed value on the display and requires at least one pressure-resistant container. The purpose is to provide.

In order to achieve this objective, the present invention houses a pump operated by a motor and a flow meter in the main body of the oil supply device provided on the island, and supplies oil to the end of the hose connected to the outflow side of the flow meter. In a ground-mounted refueling device provided with a nozzle, a flow rate transmitter is attached to the flow meter and outputs a flow rate signal proportional to the measured flow rate; A nozzle switch detects whether the refueling nozzle is connected or disconnected, an electric display displays the amount of oil supplied, signals from the flow rate transmitter and the nozzle switch are inputted, calculates the amount of oil supplied, and displays the calculation result on the electrical display. The device is configured as an intrinsically safe device with a calculation device that outputs a motor drive signal to control the start and stop of the motor as well as to a sales office machine installed in a gas station office, etc., and is connected to a commercial power source. A power supply unit containing a built-in intrinsically safe transformer that steps down the voltage, and a power supply unit that is installed between the power supply unit and the intrinsically safe device to supply the required power to the intrinsically safe device, and has a function to limit voltage or current, or both. a motor relay that is operated by a motor drive signal from the arithmetic unit; and a motor relay that is provided between a commercial power source and the motor, and is configured to activate the motor by the motor relay.
The present invention is characterized in that a magnetic switch for stopping and an interface circuit provided between the arithmetic unit and the sales office machine are provided in a single pressure-resistant explosion-proof structure container.

With this configuration, the liquid crystal display, flow rate transmitter, nozzle switch, arithmetic unit, etc. can be used as intrinsically safe devices, and the power supply section, intrinsically safe holding circuit,
Motor relays, POS interface circuits, etc. are housed as intrinsically safe related devices in a single pressure-resistant container, which satisfies the intrinsically safe explosion-proof structure as a whole, and a liquid crystal display is installed on the display surface of the fuel supply device itself. By allowing the containers to be placed close to each other, the viewing angle of the display surface can be widened, the displayed values can be easily seen, and the number of pressure containers can be reduced to one.

The present invention will be described below based on embodiments shown in the drawings.

In FIG. 1, reference numeral 1 denotes the main body of the refueling system. The main body 1 is roughly composed of a lower case 2 and an upper case 3. Inside the lower case 2, there is a pipe 4 whose one end is connected to an underground tank (not shown). A pump 6 driven by a motor 5, a flow meter 7, and an electromagnetic valve 8 that opens and closes in response to a signal from an arithmetic circuit, which will be described later, are provided in the middle of the pipe 4.
A hose 9 is connected to the other end, and a refueling nozzle 10 is provided at the tip of the hose 9. Also,
The flow meter 7 is attached with a flow rate transmitter 11 that outputs a flow rate signal proportional to the measured flow rate. On the other hand, a nozzle storage part 12 is provided on the side surface of the lower case 2 to store the refueling nozzle 10 except during refueling work. Nozzle switch 1
3 is provided.

On the other hand, as shown in FIG.
4, and window frame plates 15 and 16 forming the left and right front surfaces of the outer plate 14.
is fixed. In addition, 19 and 20 are window frame boards 1
Glass plate surrounded by 5, 16, 21, 22
are windows 21A, 21B, 21C, 22A, respectively.
Decorative boards 22B and 22C, and 23 and 24 indicate sealing members inserted between the glass plates 19 and 20 and the decorative boards 21 and 22, respectively; one glass plate 19, the sealing member 23, and the decorative board 21 are the The other glass plate 2
0, the sealing member 24 and the decorative panel 22 are fixed to the connecting portion between the outer panel 14 and the window frame board 16 via upper and lower fixtures 27 and 28. The upper case 3 is formed by these.

Next, inside the upper case 3 are container fittings 29, 3.
A pressure-resistant container 31 made of cast iron is mounted between the container fittings 29 and 30 at the center of the upper case 3. Inside the pressure container 31, various devices detailed in FIG. 3 are housed. In the figure, numeral 32 denotes a wiring lead-out portion provided on the lower surface of the pressure-resistant container 31.

On the other hand, 33 is a battery mounting plate located between the decorative plate 21 and the pressure-resistant container 31 and disposed inside the container fitting 29;
4 and 35, it is attached to the left side of the upper case 3 in the figure. A plurality of batteries 36, 36, . . . are attached to the battery attachment plate 33. Here, each of the batteries 36 is of an explosion-proof construction, and has a structure that does not require housing it in the pressure-resistant container 31 described above.

Reference numeral 37 denotes a liquid crystal board located between the decorative panel 21 and the battery mounting plate 33 and disposed in one of the fixtures 34;
It is attached to the upper case 3 via 8 and 39. On the liquid crystal board 37, from above, a liquid crystal display 40A for displaying the amount of refueling, a liquid crystal display 40B for displaying the amount of refueling, and a liquid crystal display 40C for displaying the unit price (referred to as the liquid crystal display 40 as a whole) are located on the decorative board 21 side. The respective indicators 40A, 40B,
40C is close to and faces windows 21A, 21B, and 21C.

Reference numeral 41 denotes a computing device mounting board located between the decorative board 22 and the pressure vessel 31 and disposed inside the container fixture 30. It is attached to the right side of case 3 in the figure. A plurality of arithmetic devices 44 each consisting of a microprocessor and its circuit components are mounted on the arithmetic device mounting board 41.

Reference numeral 45 denotes a liquid crystal board located between the decorative board 22 and the arithmetic device mounting board 41 and disposed in one of the fixtures 42;
It is attached to the upper case 3 via 6 and 47. On the liquid crystal substrate 45, from above, a liquid crystal display 48A for displaying the amount of refueling, a liquid crystal display 48B for displaying the amount of refueling, and a liquid crystal display 48C for displaying the unit price (referred to as the liquid crystal display 48 as a whole) are located on the decorative panel 22 side. The respective indicators 48A, 48B,
48C is close to and opposite windows 22A, 22B, and 22C.

Further, reference numeral 49 denotes a refueling amount setting switch disposed on the right side in FIG.
Reference numeral 9 includes five switches 49A, 49B, . . . 49E for setting, for example, 10l, 20l, . The refueling amount setting switch 49 has preset light emitting diodes 50A, 50 that light up to confirm the preset when the switches 49A, 49B,...49E are operated.
B, . . . 50E (collectively referred to as preset light emitting diodes 50) are attached.

Reference numeral 51 denotes a unit price setting switch disposed inside the upper case 3 on the left side of the front in FIG. Set.

Reference numeral 52 denotes a sales volume integration switch and an integration data reset switch (hereinafter referred to as
(referred to as an integration switch 52), the integration switch 5
2, accesses the integration counter section provided in the arithmetic circuit 44, displays the integrated sales amount for a predetermined period such as one day or one month on the liquid crystal displays 40 and 48, and also displays the sales amount for a predetermined period such as one day or one month, and as necessary. The integrated data is reset by the reset operation. Reference numeral 53 denotes a light emitting diode for the integration switch that lights up to confirm when the integration switch 52 is operated. The sales volume integration switch 52 is operated by opening and closing a small window (not shown) provided in the window frame plate 15.

Reference numeral 54 denotes a check light emitting diode provided on the right side of the front in FIG. It lights up as a warning when a power failure occurs or when the voltage of the battery 36 drops due to a power outage that lasts for a certain period of time or more.

Next, the arithmetic unit 44 mentioned above in FIG.
1. The integrating switch 52, the integrating switch light emitting diode 53, and the checking light emitting diode 54 are connected as shown in the figure, and each of these devices is connected to the voltage or current supplied from the intrinsically safe holding circuit, which will be described later. This is an intrinsically safe circuit that has been confirmed to be unable to ignite explosive gas by electric sparks or high-temperature parts. Starting with the arithmetic unit 44, the flow rate transmitter 11, the nozzle switch 1
3. Has intrinsically safe circuits consisting of liquid crystal displays 40, 48, fuel supply amount setting switch 49, preset light emitting diode 50, unit price setting switch 51, integration switch 52, integration switch light emitting diode 53, and check light emitting diode 54. This constitutes an intrinsically safe device 55 as shown by the dashed line in FIG.

Furthermore, the pressure vessel 31 described above in FIG.
Inside, there is an intrinsically safe power supply section 56, an intrinsically safe holding circuit 57,
Motor relay 58, magnetic switch 59,
A phase advance capacitor 60, a solenoid valve relay 61, and a POS interface circuit 62 are built-in.

First, the power supply unit 56 is connected to a commercial power supply 63 of AC 100V, for example, and is provided with an intrinsically safe transformer such as a transformer with a contact prevention plate for stepping down the voltage of the commercial power supply 63, a rectifier circuit, and the like.

The intrinsically safe holding circuit 57 includes the power supply section 56 and the intrinsically safe device 55.
The intrinsically safe holding circuit 57 includes a safety holding element such as a Zener barrier, an overvoltage limiting relay, or an overcurrent limiting resistor, and has the function of limiting voltage, current, or both. It has become a complicated electrical circuit. Further, the intrinsically safe holding circuit 57 is connected to the battery 36 provided outside the pressure-resistant container 31, and the intrinsically safe holding circuit 57 has a constant voltage circuit and a voltage drop between the commercial power source 63 detected and automatically charged to the battery 36. Built-in uninterruptible switching circuit. The intrinsically safe holding circuit 57 is capable of supplying the required voltage or current limited power to the intrinsically safe equipment 55 including the arithmetic unit 44 described above. In FIG. 3, the intrinsically safe holding circuit 57 is shown to be connected only to the arithmetic unit 44, but it can also be connected to other intrinsically safe circuits such as the flow rate transmitter 11, nozzle switch 13, liquid crystal display 40, 48, etc. It is something that is connected.

The motor relay 58 is composed of an intrinsically safe relay, and the motor relay 58 is connected to the oil supply nozzle 10.
is removed from the nozzle housing 12 and the nozzle switch 1 is removed.
3 is closed, the magnetic switch 5 is excited by the motor start signal from the arithmetic unit 44.
9 is closed, and on the other hand, when the refueling nozzle 10 is applied to the nozzle housing 12 and the nozzle switch 13 is opened, the motor is demagnetized by a motor stop signal from the arithmetic unit 44, and the magnet switch 59 is opened.

On the other hand, the magnetic switch 59 and the phase advancing capacitor 60 are connected between the motor 5 and a commercial power source 64 of AC200V, for example, and the magnetic switch 59 is closed when the motor relay 58 is energized. The motor 5 is started, thereby driving the pump 6, and when the motor relay 58 is demagnetized, it is opened to stop the motor 5 and drive the pump 6.

In addition, the solenoid valve relay 61 is also the motor relay 5.
Similar to 8, it is composed of an intrinsic safety relay, and during normal refueling, it is demagnetized and keeps the solenoid valve 8 open, but it is output from the computing device 44 only during preset refueling using the refueling amount setting switch 49. The electromagnetic valve 8 is excited by a quantitative signal, and the solenoid valve 8 is closed in a quantitative manner. After preset refueling, the refueling nozzle 10 is connected to the nozzle storage part 12, and after the nozzle switch 13 is opened, a valve opening signal from the computing device 44 is used to
The solenoid valve relay 61 is demagnetized again to open the solenoid valve 8.

Furthermore, the POS interface circuit 62 is installed in the computing device 44 and in the gas station office, etc.
It is connected to the POS 65 and inputs data such as the amount of refueling and the amount of refueling from the computing device 44 to the POS 65.
In addition, necessary information from the POS 65 is sent to the computing device 44.
Enter.

Therefore, a power supply unit 56, an intrinsically safe holding circuit 57, a motor relay 58, and
The electromagnetic valve relay 61 and the POS interface circuit 62 constitute intrinsically safe related equipment that satisfies the specifications necessary to maintain the intrinsically safe explosion-proof property of the intrinsically safe circuit.

In addition, 66 and 67 in FIG. 2 are window frame plates 15 and 16.
This is a fluorescent light installed at the top of the.

Although the present invention is configured as described above, normal refueling work will be described below. First, when the refueling nozzle 10 is removed from the nozzle housing 12, the nozzle switch 13
is closed, and this signal is input to the arithmetic unit 44,
The liquid crystal display 40,
48 and outputs a reset signal to the POS 65 via the POS interface circuit 62. Further, the motor relay 58 is excited by the motor start signal from the arithmetic unit 44, and the magnetic switch 5 is activated by this contact.
9 is excited to drive the motor 5. Next, when the refueling nozzle 10 is inserted into the fuel tank of the vehicle and the valve is opened, the oil in the underground tank is supplied via the pipe 4, the pump 6, the flow meter 7, the solenoid valve 8, and the hose 9. The flow rate during this time is measured by the flow meter 7,
The flow rate signal from the flow rate transmitter 11 is input to the calculation device 44 and counted, and the amount is calculated based on the unit price from the unit price setting switch 51, and this value is used to display the amount of refueling on the liquid crystal displays 40 and 48. Liquid crystal display 40A, 48A, liquid crystal display 40B, 40B for displaying refueling amount, liquid crystal display 40C for unit price display,
48C as the refueling amount, amount, and unit price, respectively. On the other hand, these values are also input to the POS 65 via the POS interface circuit 62.
When the desired amount of refueling is reached, the refueling nozzle 10 is closed;
When hung on the nozzle storage part 12, the nozzle switch 13
is opened, this signal is input to the arithmetic unit 44, which outputs a motor stop signal to the motor relay 58,
The relay 58 is demagnetized and the contact point demagnetizes the magnetic switch 59, thereby stopping the drive of the motor 5. This completes the series of refueling operations.

On the other hand, in order to perform preset lubrication work, first turn the desired switch 4 of the lubrication amount setting switches 49 on.
9A, 49B, . After that, when a refueling operation similar to the normal refueling operation described above is performed, refueling is started, and the calculation device 44 compares the refueling amount based on the flow rate signal inputted every moment from the flow rate transmitter 11 with the preset refueling amount, When the fixed amount is reached, a fixed amount signal is output to the electromagnetic valve relay 61. As a result, the solenoid valve 8 is energized and closed by a fixed amount.
After that, when the operator closes the refueling nozzle 10 and hooks it to the nozzle housing 12, the nozzle switch 13 opens, and the output from the computing device 44 demagnetizes the solenoid valve relay 61 and reopens the solenoid valve 8. valve and return to its original state. When refueling during preset refueling, if the valve does not close due to an accident with the solenoid valve 8 or the like and overflows by a predetermined amount or more, the check light emitting diode 54 is turned on by the output from the arithmetic unit 44, and the operator issue a warning against.

Next, for example, to check the total sales volume for a day, the calculation device 44 is accessed by pressing the integration switch 52, and the accumulated value is input to the integration counter section in the calculation device 44. The amount is displayed on the liquid crystal displays 40A and 48A. This allows you to know the daily sales volume. Also,
To reset the data in the integration counter section, the integration switch 52 may be reset.

Furthermore, when a voltage drop occurs in the commercial power supply 63 due to a power outage, etc., the uninterruptible circuit in the intrinsically safe holding circuit 57 detects this and automatically switches to the battery 36, erasing the data in the arithmetic unit 44. It prevents you from doing so. On the other hand, even when a voltage drop occurs, the check light emitting diode 54 lights up to notify the operator that a power outage has occurred.

Therefore, in the present invention, the liquid crystal display devices 40, 4
8 can be configured as an intrinsically safe circuit,
Unlike the prior art, there is no need to house it in a pressure-resistant container in order to have a pressure-resistant and explosion-proof structure. Therefore, as shown in FIG.
2, the viewing angle can be widened, and the displayed value can be easily seen even when relatively dark liquid crystal is used as the display element.

In addition, a flow rate transmitter 11, a nozzle switch 13,
Oil supply amount setting switch 49, unit price setting switch 5
1, integrating switch 52, light emitting diode 50,5
Since 3, 54, etc. are also constructed as intrinsically safe circuits, even if they are distributed in the oil supply device body 1, there is no need to provide them in a pressure-resistant container, and the space within the oil supply device body 1 can be effectively utilized. In addition, it can be made small and manufactured at low cost.

Furthermore, a power supply unit 56 directly connected to commercial power supplies 63 and 64, a motor relay 58, and a solenoid valve relay 6
1. The magnetic switch 59, phase advance capacitor 60, etc., and the POS interface circuit 62 connected to the remote POS 65 can be housed together in one pressure-resistant container 31, so the structure is extremely simple. can be converted into On the other hand, Batsuteri 3
By using an explosion-proof construction for 6, it can be provided outside the pressure vessel 31.

Incidentally, in the above-mentioned embodiment, the refueling device main body 1 was described as being composed of a lower case 2 and an upper case 3, but this is a design problem.
It may be a conventionally known box-shaped oil supply device main body. Further, although the liquid crystal displays 40 and 48 have been described as being provided on the front and rear surfaces of the upper case 3, they may be provided only on one side. Furthermore, a solenoid valve 8, a battery 36,
Oil supply amount setting switch 49, unit price setting switch 5
1, integrating switch 52, each light emitting diode 50,
53, 54, etc. are provided according to the specifications of each case, and when the preset lubrication function is not required, it is not necessary to provide the solenoid valve 8 and the lubrication amount setting switch 49, and the amount will be displayed on the liquid crystal display 40, 48. When the display function and unit price display function are not required, there is no need to provide the unit price setting switch 51 either.

Since the ground-mounted refueling system according to the present invention is as described in detail above, the values displayed by the electric display can be easily seen from the outside, and the viewing angle can be widened. In addition, since the number of pressure-resistant containers can be reduced to one, it is possible to manufacture the oil supply device at low cost and to downsize the oil supply device. Furthermore, not only can all controls be processed by the arithmetic unit, but also various functions can be easily added as needed.

[Brief description of the drawings]

Fig. 1 is a partially cutaway overall diagram showing the ground-mounted refueling device of the present invention, Fig. 2 is a cross-sectional view taken along the line indicated by the arrow in Fig. 1, and Fig. 3 is an electrical circuit diagram. 1... refueling device body, 5... motor, 6... pump, 7... flow meter, 9... hose, 10... refueling nozzle, 11... flow rate transmitter, 12... nozzle storage section, 13... nozzle switch, 14... outer plate, 15, 16... window frame plate, 19, 20... glass plate, 21, 22... decorative plate, 31... pressure-resistant container, 36... battery, 40, 48... liquid crystal display, 44... computing device, 49... refueling amount setting switch, 51... unit price setting switch, 54... light-emitting diode for checking, 55... intrinsic safety device, 56...
...... Power supply unit, 57 ...... Intrinsic safety circuit, 58 ...... Motor relay, 59 ...... Magnet switch, 6
0...phase-leading capacitor, 61...solenoid valve relay, 62...POSI/F, 63, 64...commercial power supply, 65...POS.

Claims (1)

[Scope of utility model registration request] A ground-mounted refueling device, which houses a pump operated by a motor and a flow meter in the refueling device main body installed on the island, and has a refueling nozzle at the end of a hose connected to the outflow side of the flow meter, a flow rate transmitter attached to the flow meter and outputting a flow rate signal proportional to the measured flow rate; a nozzle switch provided in the nozzle storage section in which the refueling nozzle is placed and detecting whether the refueling nozzle is connected or disconnected; , an electric display that displays the amount of refueling, signals from the flow rate transmitter and the nozzle switch are input, the amount of refueling is calculated, and the calculation results are sent to the electric display and a sales station installed in the gas station office, etc. An arithmetic device that outputs a motor drive signal for controlling the start and stop of the motor as well as an output to an office machine is configured as an intrinsically safe device, and a power supply section that has a built-in intrinsically safe transformer that steps down the voltage of the commercial power source; , an intrinsically safe holding circuit that is provided between the power supply unit and the intrinsically safe device in order to supply the required power to the intrinsically safe device, and has a function of limiting voltage or current or both;
a motor relay operated by a motor drive signal from the arithmetic unit; and a magnetic switch provided between a commercial power source and the motor to start and stop the motor by the motor relay; A ground-mounted refueling system characterized in that an interface circuit provided between the arithmetic unit and the sales office machine is provided in a single pressure-resistant explosion-proof container.